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Linux 5.16: The blk-cgroup.h header is where struct blkcg_gq is defined

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The definition of struct blkcg_gq was moved into blk-cgroup.h, which is
a header that's been in Linux since 2015. This is used by
vdev_blkg_tryget() in module/os/linux/zfs/vdev_disk.c. Since the kernel
for CentOS 7 and similar-generation releases doesn't have this header,
its inclusion is guarded by a configure test.

Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Coleman Kane <ckane@colemankane.org>
Closes #12819
This commit is contained in:
Coleman Kane 2021-12-03 22:00:10 -05:00 committed by Tony Hutter
parent ea61e07413
commit bef7c02c81
2 changed files with 30 additions and 0 deletions
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27
config/kernel-bio.m4
View File

@ -449,6 +449,31 @@ AC_DEFUN([ZFS_AC_KERNEL_BDEV_SUBMIT_BIO_RETURNS_VOID], [
])
])
dnl #
dnl # Linux 5.16 API
dnl #
dnl # The Linux 5.16 API moved struct blkcg_gq into linux/blk-cgroup.h, which
dnl # has been around since 2015. This test looks for the presence of that
dnl # header, so that it can be conditionally included where it exists, but
dnl # still be backward compatible with kernels that pre-date its introduction.
dnl #
AC_DEFUN([ZFS_AC_KERNEL_SRC_BLK_CGROUP_HEADER], [
ZFS_LINUX_TEST_SRC([blk_cgroup_header], [
#include <linux/blk-cgroup.h>
], [])
])
AC_DEFUN([ZFS_AC_KERNEL_BLK_CGROUP_HEADER], [
AC_MSG_CHECKING([for existence of linux/blk-cgroup.h])
ZFS_LINUX_TEST_RESULT([blk_cgroup_header],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_LINUX_BLK_CGROUP_HEADER, 1,
[linux/blk-cgroup.h exists])
],[
AC_MSG_RESULT(no)
])
])
AC_DEFUN([ZFS_AC_KERNEL_SRC_BIO], [
ZFS_AC_KERNEL_SRC_REQ
ZFS_AC_KERNEL_SRC_BIO_OPS
@ -462,6 +487,7 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_BIO], [
ZFS_AC_KERNEL_SRC_BIO_BDEV_DISK
ZFS_AC_KERNEL_SRC_BDEV_SUBMIT_BIO_RETURNS_VOID
ZFS_AC_KERNEL_SRC_BIO_SET_DEV_MACRO
ZFS_AC_KERNEL_SRC_BLK_CGROUP_HEADER
])
AC_DEFUN([ZFS_AC_KERNEL_BIO], [
@ -485,4 +511,5 @@ AC_DEFUN([ZFS_AC_KERNEL_BIO], [
ZFS_AC_KERNEL_BLKG_TRYGET
ZFS_AC_KERNEL_BIO_BDEV_DISK
ZFS_AC_KERNEL_BDEV_SUBMIT_BIO_RETURNS_VOID
ZFS_AC_KERNEL_BLK_CGROUP_HEADER
])

3
module/os/linux/zfs/vdev_disk.c
View File

@ -37,6 +37,9 @@
#include <linux/blkpg.h>
#include <linux/msdos_fs.h>
#include <linux/vfs_compat.h>
#ifdef HAVE_LINUX_BLK_CGROUP_HEADER
#include <linux/blk-cgroup.h>
#endif
typedef struct vdev_disk {
struct block_device *vd_bdev;